Novel logarithmic corrections to black hole entropy
arXiv:2104.05388 · doi:10.1088/1361-6382/ac95ef
Abstract
For a thermodynamic system, apart from thermal fluctuations, there are also fluctuations in thermodynamic volume when the system is in contact with a volume reservoir. For the case of black holes in anti-de Sitter spacetimes, the effect of thermal fluctuations on the entropy is well studied. The aim of this work is to compute novel logarithmic corrections to black hole entropy coming from simultaneous fluctuations of energy and thermodynamic volume. We work in the isothermal-isobaric ensemble and first obtain a general form of corrections to entropy which are valid for any thermodynamic system. Applying the formalism to Kerr black holes in AdS reveals that the black hole entropy gets corrected as: where is given by the Bekenstein-Hawking formula and . The same leading coefficient is also obtained in the canonical ensemble, i.e. by considering energy fluctuations alone. This coefficient is found to be unaltered in the slowly rotating and high temperature limits.
arXiv commentv1: 18 pages; v2 20 pages, typos corrected, references added, additional subsection added on Gauss-Bonnet black holes; v3: 25 pages, revised version, figures and references added
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